An annual examination is planned for public buildings without risk patients. This can be extended to up to three years if
- the annual sampling has been carried out three times in a row without any abnormalities and
- the installation complies with the “generally recognised rules of technology” and
- the mode of operation of the potable water installation does not show any significant change in operation compared to the testing interval, such as large-scale vacancies.
For public buildings such as hospitals, dialysis centres or similar facilities for “patients at higher risk of hospital infections”, sampling at 1-year intervals is mandatory without exception.
New installations of large systems in public buildings must still be reported to the public health department – regardless of the regular testing for legionella and the findings.